Mold for the manufacture of artificial teeth



(No Model.)

W. R. HALL. MOLD POR THB MANUPAGTURE 0F ARTIFICIAL TEETH.

No. 404,703. Patented June 4, 1889.

ymnna nwmmllllmumlll'l y u NITED STATES PATENT OFFICE.

VILLIAM R. HALL, OF PHILADELPHIA, PENNSYLVANIA.

MOLD FOR THE MANUFACTURE `OF ARTIFICIAL TEETH.

SPECIFICATION forming part of Letters Patent No. 404,703, dated J' une 4, 1889.

Application tiled October 29, 1888. Serial 110.289,431. (No model.)

To all whom, t may concern,.-

Be it known that I, VILLIAM R. HALL, of the city of. Philadelphia, and State of Penn- Sylvania, have invented a certain new and useful Improvement in Molds for the Manufacture of Artificial Teeth, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification. My invention has relation to molds for the manufacture of artificial teeth provided with stamped matrices which form linings to the tooth-concavity of the mold; and it consists in the elements and features hereinafter particularly described and claimed.

The object of my invention is to produce in a mold for the manufacture of artificial teeth a mold-shell having the exact form,

shape, anddelineation of the natural tooth,

which mold-shells I form by means of dies properly graved. The features and advantages of my invention are as hereinafter set fort-h.

In the accompanying drawings similar letters of reference refer to similar parts throughout.

Figure l represents the lower half of the mold-shells applied to a molding-frame in a convenient number orseries. Fig. 2 represents the upper or corresponding half of the same. Fig. 3 is a perspective view of the molding-frame closed, as in the act of molding. Fig. 4 is a cross-sectional view of the mold in the lines 0c of Figjl. Fig. 5 shows the male section of the die for producing the molding-shell. Fig. 6 is a-perspective view of a one-half section of the mold-shell separated from the molding-frame.

a a represent thehalf-sections of the moldshells.

A represents the lower half of the moldingframe, to which the sections of the mold-shell a a are applied.

A represents the upper or corresponding half of the molding-frame.

D represents the die, presenting in relief the shape and conformity of the front of an artificial tooth desired to bc produced, as a convenient and expeditious method of making the shells.

b is the backing-plate, provided with concavities corresponding in shape to the outward form of the mold-shells a a', into which the said shells aa. are set or countersunk, as a convenient method of applying them to the mold-frame A A, which said plate b is screwed or otherwise fitted into the said frame. Pins c c are provided on the ends of the frame A A', which fit into the orifices c and secure the upper and lower sections of the moldingframe in the proper position in the process of molding.

The shells a a are of thin sheet-nickel or other suitable material, and are given the proper conformity and shape of the face or the back of the artificial tooth to be produced, as the case may be, by means of y a die, such as shown in Fig. 5, or other suitable means. These sections a a are set or countersunk into the backing-plate b, provided with concavities, as described, shaped in conformity to the outer conformation of the respective shell-sections. The backing-plate b, provided with the said shell-sections a a', is fitted into a suitable molding-frame, such as shown in Figs. l, 2, and 3, in such a position that the edges of the shell-sections shall be on a line with the inner surface c e or e e of the moldin g-frame A A. In this way the surface of the edge of the half-section a will come into exact conformity and juxtaposition with its mate a", adjusted in the other half of the molding-frame, when the frames A A are adjusted together, as shown in Fig. 3. It will thus be seen that when the requisite quantity of plastic composition is provided in the shell-sections and the section A of the molding-frame is adjusted upon the section A the plastic composition will be given the shape of an artificial tooth of the combined forms of the shells a a. The molding-frames A A are preferably made of heavy brass or bronze,

towithstand the wear and tear involved in the ordinary heating and molding process to which they are thereupon subjected.

A particular feature of my invention is the shell-mold for the manufacture of artificial.

teeth, which does away with the necessity of cutting and shaping the cavities for molding the teeth with gravers, and produces a cheaper, better, and more uniform mold than those heretofore used in the manufacture of artificial teeth.

Having thus described my invention, what IOO I claim, and desire to Secure by Letters Pat- In Witness whereof I have hereunto set my ent,ishand this 24th dey of October, A. D. 1888.

In an artificial-tooth mold, the moldingframe A A', in combination with the inold- VILLIAM R. HALL.

5 shells a a', the backing-plate b, in which the mold-shells are set, the frame provided with Titnessesz the pins o c, and the orifices c c', substantially )HARLES W. ROGER, :is herenbefore Set forth and described, HORACE PETTlT. 

